8. Dive bomber push-up

Start with your hands shoulder-width apart, your feet spread wide and your bum up in the air. Drop your head between your upper arms. Your body should be shaped like a triangle. Now, start to bend your arms and slowly slide your head toward the ground. Keep your chin an inch or two from the ground, then pull up so that your back is arched. To complete the push-up, reverse what you’ve just done until you’re back in the triangle position. It helps to imagine that you're ducking under a fence.